A flight trip carries one or more fares, each with kind "wego", "airline" or "partner". Wego fares are bookable on wego.com and continue into getFareOptions (/v1/flights/fares/{fareId}/options, the fare’s bookable options such as Saver and Flex; an option’s id is its brandedFareId) and getFareBookingLink (/v1/flights/fares/{fareId}/booking-link). Airline and partner fares are fulfilled by the airline or the travel agency directly; they carry their own handoff URL in the results and do not work with the fare endpoints.
Hotel rates follow the same rule: everything getHotelRates (/v1/hotels/{hotelId}/rates) returns is bookable on wego.com, each rate carrying board and refundability fields plus a rate id for the checkout link.